US10764008B2 - Methods and apparatuses for transmitting and receiving reference signals - Google Patents

Methods and apparatuses for transmitting and receiving reference signals Download PDF

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US10764008B2
US10764008B2 US16/085,832 US201616085832A US10764008B2 US 10764008 B2 US10764008 B2 US 10764008B2 US 201616085832 A US201616085832 A US 201616085832A US 10764008 B2 US10764008 B2 US 10764008B2
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group
csi
array
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US20190109686A1 (en
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Chuangxin JIANG
Yukai GAO
Gang Wang
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences

Definitions

  • Embodiments of the present disclosure generally relate to wireless communication techniques and more particularly relate to a method and apparatus for transmitting reference signals and a method and apparatus for receiving reference signals.
  • Multi-antenna techniques can significantly increase data rates and reliability of a wireless communication system.
  • the performance can be in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a multiple-input multiple-output (MIMO) communication channel.
  • MIMO multiple-input multiple-output
  • Such systems and/or related techniques are commonly referred to as MIMO.
  • LTE Long Term Evolution
  • a core component in LTE is support of MIMO antenna deployments and MIMO related techniques.
  • one-dimensional (horizontal) antenna array can provide flexible beam adaption in the azimuth domain only through the horizontal precoding process, while fixed down-tilt is applied in the vertical direction.
  • FD-MIMO full dimensional MIMO
  • CSI-RS Channel State Information Reference Signals
  • technologies for further FD-MIMO enhancement are also required to be studied.
  • CSI-RS ports OCC indices RE locations 15, 16, 19, 20 0, 1, 2, 3 RE locations for antenna ports ⁇ 15, 16, 19, 20 ⁇ for the first 8-port resource 17, 18, 21, 22 0, 1, 2, 3 RE locations for antenna ports ⁇ 17, 18, 21, 22 ⁇ for the first 8-port resource 23, 24, 27, 28 0, 1, 2, 3 RE locations for antenna ports ⁇ 15, 16, 19, 20 ⁇ for the second 8-port resource 25, 26, 29, 30 0, 1, 2, 3 RE locations for antenna ports ⁇ 17, 18, 21, 22 ⁇ for the second 8-port resource
  • FIG. 1 illustrates the CSI-RS pattern for 16-port CSI-RS RE mapping for CDM-4, wherein a CDM group comprises 4 RE and two CDM group forms 8 REs for mapping a legacy 8-port CSI-RS as illustrated by bold line blocks in FIG. 1 .
  • FIG. 2 illustrates the CSI-RS pattern for 12-port CSI-RS RE mapping for CDM-4, wherein a CDM group comprises 4 REs but these 4 REs are two separate groups of REs as illustrated by bold line blocks in FIG. 2 .
  • FIG. 3 illustrate the sequence W p′ (i) for CDM-4, which is an OCC sequence with a length of 4.
  • Class A CSI-RS resource port numbers used for the k-th component resources with Rel-12 port number p′ are given as follows:
  • FIG. 4 illustrates CSI-RS pattern for 16-port CSI-RS RE mapping for CDM-2, which comprises two 8-port configurations.
  • the CSI-RS ports include frame structure types 1 and 2 each comprising 8 CSI-RS ports.
  • the first 8 CSI-RS ports i.e. ports 15-22
  • the second 8 CSI-RS ports i.e. ports 23-30
  • a method for transmitting reference signals comprises: transmitting the reference signals using a first group of configuration resources within a first transmission resource group; and transmitting the reference signals using a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • a method of receiving reference signals comprising receiving the reference signals in a first group of configuration resources within a first transmission resource group; and receiving the reference signals in a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • an apparatus for transmitting reference signals comprises: a first reference signal transmission unit, configured to transmit the reference signals using a first group of configuration resources within a first transmission resource group; and a second reference signal transmission unit, configured to transmit the reference signals using a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources
  • an apparatus for receiving reference signals comprises: a first reference signal receiving unit, configured to receive the reference signals in a first group of configuration resources within a first transmission resource group; and a second reference signal receiving unit, configured to receive the reference signals in a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • a computer-readable storage media with computer program code embodied thereon, the computer program code configured to, when executed, cause an apparatus to perform actions in the method according to any embodiment in the first aspect.
  • a computer-readable storage media with computer program code embodied thereon, the computer program code configured to, when executed, cause an apparatus to perform actions in the method according to any embodiment in the second aspect.
  • a computer program product comprising a computer-readable storage media according to the fifth aspect.
  • a computer program product comprising a computer-readable storage media according to the sixth aspect.
  • it may support more ports for reference signals such as CSI-RS, and the legacy CSI-RS resource configuration mechanism can be reused and at the same time the RRC signal overhead, standard complexity and impact on the legacy UE can be reduce substantially.
  • reference signals such as CSI-RS
  • FIG. 1 illustrates the CSI-RS pattern for 16-port CSI-RS RE mapping for CDM-4 in 36.211 d00 of Rel. 13 Agreements in RAN1 #84;
  • FIG. 2 illustrates the CSI-RS pattern for 12-port CSI-RS RE mapping for CDM-4 in 36.211 d00 of Rel. 13 Agreements in RAN1 #84;
  • FIG. 3 illustrate the sequence W p′ (i) for CDM-4 in 36.211 d00 of Rel. 13 Agreements in RAN1 #84;
  • FIG. 4 illustrates CSI-RS pattern for 16-port CSI-RS RE mapping for CDM-2 in 36.211 d00 of Rel. 13 Agreements in RAN1 #84;
  • FIG. 5 schematically illustrates a flow chart of a method for transmitting reference signals according to an embodiment of the present disclosure
  • FIG. 6 schematically illustrates a CSI-RS port resource allocation scheme for 28 or 32 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 7 schematically illustrates a CSI-RS port resource allocation scheme for 20 or 24 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 8 illustrates another CSI-RS port resource allocation scheme for 28 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 9 illustrates a further CSI-RS port resource allocation scheme for 28 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 10 illustrates a still further CSI-RS port resource allocation scheme for 28 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 11 illustrates another CSI-RS port resource allocation scheme for 20 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIG. 12 illustrates an example transmission resource group division and CSI-RS port resource allocation schemes in TDM mode in accordance with embodiments of the present disclosure
  • FIG. 13 illustrates another CSI-RS port resource allocation scheme for a 28-port CSI-RS configuration in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 14 illustrates a further CSI-RS port resource allocation scheme for a 28-port CSI-RS configuration in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 15 illustrates a new ZP CSI-RS configuration in accordance with embodiments of the present disclosure
  • FIGS. 16 and 17 illustrate different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 18 and 19 illustrate different sub-array mapping for 32 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 20 to 21 illustrate another different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 22 to 23 illustrate further different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 24 to 25 illustrate still further different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 26 to 27 illustrate different sub-array divisions for 28 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 28 to 29 illustrate another different sub-array divisions for 28 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 30 to 31 illustrate further different sub-array divisions for 24 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 32 to 33 illustrate further different sub-array divisions for 24 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 34 to 35 illustrate another different sub-array divisions for 20 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIGS. 36 to 37 illustrate further different sub-array divisions for 20 CSI-RS ports in accordance with embodiments of the present disclosure
  • FIG. 38 illustrates an example sub-array group division for 32 CSI-RS ports with CDM-2 in accordance with embodiments of the present disclosure
  • FIG. 39 illustrates an example sub-array group division for 28 CSI-RS ports with CDM-2 in accordance with embodiments of the present disclosure
  • FIG. 40 illustrates an example sub-array group division for 32 CSI-RS ports with CDM-4 in accordance with embodiments of the present disclosure
  • FIG. 41 illustrates an example sub-array group division for 24 CSI-RS ports with CDM-2 in TDM mode in accordance with embodiments of the present disclosure
  • FIG. 42 illustrates sub-array group and sub-array mapping in TDM mode in accordance with embodiments of the present disclosure
  • FIG. 43 illustrates an example of Orthogonal Variable Spreading Factor for OCC in accordance with embodiments of the present disclosure
  • FIG. 44 illustrates a scheme for CDM 8 for 32 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 45 illustrates another scheme for CDM 8 for 32 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 46 illustrates further scheme for CDM 8 for 32 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure
  • FIG. 47 illustrates another scheme for CDM 8 for 32 CSI-RS ports in TDM mode in accordance with embodiments of the present disclosure
  • FIG. 48 illustrates a first sequence part and a second sequence part of the OCC sequence in accordance with embodiments of the present disclosure
  • FIG. 49 illustrates a scheme for using the first sequence part and the second sequence part of the OCC sequence in accordance with embodiments of the present disclosure
  • FIG. 50 illustrates a composite channel for legacy UE in in accordance with embodiments of the present disclosure
  • FIG. 51 illustrates another example of Orthogonal Variable Spreading Factor for OCC in accordance with embodiments of the present disclosure
  • FIG. 52 schematically illustrates a flow chart of a method 5200 of receiving reference signals according to another embodiment of the present disclosure
  • FIG. 53 schematically illustrates a block diagram of an apparatus 5300 for transmitting reference signals in accordance with one embodiment of the present disclosure
  • FIG. 54 schematically illustrates a block diagram of an apparatus 5400 for receiving reference signals in accordance with another embodiment of the present disclosure.
  • FIG. 55 further illustrates a simplified block diagram of an apparatus 5510 that may be embodied as or comprised in UE and an apparatus 5520 that may be embodied as or comprised in a base station in a wireless network as described herein.
  • each block in the flowcharts or blocks may represent a module, a program, or a part of code, which contains one or more executable instructions for performing specified logic functions, and in the present disclosure, a dispensable block is illustrated in a dotted line.
  • these blocks are illustrated in particular sequences for performing the steps of the methods, as a matter of fact, they may not necessarily be performed strictly according to the illustrated sequence. For example, they might be performed in reverse sequence or simultaneously, which is dependent on natures of respective operations.
  • block diagrams and/or each block in the flowcharts and a combination of thereof may be implemented by a dedicated hardware-based system for performing specified functions/operations or by a combination of dedicated hardware and computer instructions.
  • a user equipment may refer to a terminal, a Mobile Terminal (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), Mobile Station (MS), or an Access Terminal (AT), and some or all of the functions of the UE, the terminal, the MT, the SS, the PSS, the MS, or the AT may be included.
  • MT Mobile Terminal
  • PSS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • BS may represent, e.g., a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a radio header (RH), a remote radio head (RRH), a relay, or a low power node such as a femto, a pico, and so on.
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • RH radio header
  • RRH remote radio head
  • relay or a low power node such as a femto, a pico, and so on.
  • embodiments of the present disclosure are directed to a new CSI-RS design and a new solution for reference signal transmission and receiving.
  • the solution can be performed between a serving node like eNB and a terminal device like UE, so as to support reference signal transmission with more ports.
  • the transmission resources are divided into at least two groups, i.e., a first group of configuration resources and the second group of configuration resources.
  • Reference signals for the UE are transmitted jointly using configuration resource groups within the first and second transmission resource groups so as to support more ports and particularly, the first transmission resource group can be determined based resource configurations allocated for the reference signals while the second transmission resource groups can be a subset of the first group of configuration resources.
  • the configuration resource group for the first transmission resource group and the second transmission resource group can be indicated to the UE by one or more indications.
  • An antenna array for transmitting reference signals can be divided into a first sub-array and a second sub-array which can be mapped to the first transmission resource group and the second transmission resource group respectively; and preferable in at least one of a first sub-array and a second array, the sub-array can be further divided into a plurality of sub-array groups which can be mapped to different resource configurations in respective transmission resource group.
  • a high order OCC can be used to support CDM-8 and the OCC can comprise a part containing legacy OCC sequences which can be used to multiplex configuration resources which can be used by legacy users.
  • the terminal device may comprise UE, such as a terminal, an MT, an SS, a PSS, an MS, or an AT.
  • the serving node may comprise a BS, such as a node B (NodeB or NB), or an evolved NodeB (eNodeB or eNB).
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • CSI-RS will be mainly taken as an example of reference signals as recited herein and in face the present disclosure is not limited thereto.
  • FIG. 5 schematically illustrates a flow chart of a method 500 for transmitting reference signals in accordance with an embodiment of the present disclosure.
  • the method 500 can be performed at a serving node, for example a BS, like a node B (NodeB or NB),
  • NodeB or NB node B
  • the method 500 starts from step 501 , in which, the reference signals are transmitted using a first group of configuration resources within a first transmission resource group and in step 502 , reference signals are transmitted in the second group of configuration resource within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • the transmission resources are divided into at least two groups, i.e., the first group of configuration resources and the second group of configuration resources.
  • the term “transmission resource” used herein means the time-frequency resources for signal transmission.
  • the transmission resources mean Physical Resource Blocks (PRBs); in a Time Division Multiplexing (TDM) mode, the transmission resources mean specific PRBs in subframes.
  • the PRBs in one subframe can be divided into at least two transmission resource groups, for example, those even-numbered PRBs and those odd-numbered PRBs.
  • One of the first transmission resource group and the second transmission resource group contains odd-numbered PRBs and the other of them contains even-numbered PRBs.
  • the first transmission resource group and the second transmission resource group are in different subframes.
  • not all REs are configured for a predetermined reference signal transmission, some REs are used to transmit data, some REs are used to transmit control information, some REs are used to transmit Common Reference Signal (CRS), some REs are used to transmit Demodulation Reference signal (DMRS) and some RES are used to transmit CSI-RS signals.
  • CRS Common Reference Signal
  • DMRS Demodulation Reference signal
  • RES are used to transmit CSI-RS signals.
  • the reference signal is CSI-RS
  • those REs for CSI-RS within a transmission resource group are called a group of configuration resources.
  • PRB or PRB pair in this embodiment means one Physical Resource Block in one subframe.
  • FIGS. 6 to 11 illustrate example transmission resource group division and CSI-RS port resource allocation schemes in FDM mode in accordance with embodiments of the present disclosure.
  • PRB #n for example belongs to the first transmission resource group while PRB# n+1 belongs to the second transmission resource group.
  • PRB #n+1 belongs to the first transmission resource group while PRB# n belongs to the second transmission resource group.
  • PRB #n+1 belongs to the first transmission resource group while PRB# n belongs to the second transmission resource group.
  • the number of real CSI-RS antenna ports for 28 CSI-RS ports is 28, while the allocated CSR-RS resources contain two 8-port CSI-RS configurations in each PRB pair, i.e. 32 REs in the adjacent PRB pairs.
  • the allocated CSI-RS resource REs are more than the real CSI-RS antenna ports. Therefore, all REs in A1 can be used but four REs in A2 can be unused resources and they can be muted so that their power can be lent to other REs to perform power boosting, thereby tackling power boosting issues.
  • the mute REs cannot be used transmitted Data.
  • the first group of configuration resources (16 ports, i.e., N1) are used within the first transmission resource group while the second group of configuration resources (12(16-4) ports, i.e., N2) are used within the second transmission resource group.
  • N2 is a subset of N1, i.e., N2 ⁇ N1.
  • the eNB may send an indication for the first group of configuration resources (N1) and the UE may determine the second group of configuration resources (N2) based on the first group of configuration resources (N1) and the predetermined resource allocation polices which are known by both the eNB and UE.
  • REs for REs to be muted, they can also be informed to the UE by an indication like an RRC signaling in step 505 , or the four REs can be default information between the eNB and UE and in such a case no RCC signaling is required.
  • one CDM4 group or one 4-port CSI-RS configuration can be mute as the similar way in the description of FIGS. 8 and 9 .
  • the eNB can further send an indication for the second group of configuration resources N2 to the UE directly in step 504 .
  • resource to be muted can be determined based on the first group of configuration resources N1 and the second group of configuration resources N2, and thus no RRC signaling or default signaling are required.
  • FIG. 7 illustrates a CSI-RS port resource allocation scheme for 20 CSI-RS ports in accordance with embodiments of the present disclosure.
  • the transmission resources are divided in a similar way, i.e., the first transmission resource group contains PRB #n and the second transmission resource group contains PRB# n+1.
  • the number of real CSI-RS antenna ports for 20 CSI-RS ports is 20, while the allocated CSR-RS resource are three 4-port CSI-RS configurations in each transmission resource group, i.e. 24 REs in the two adjacent PRB pairs.
  • the allocated CSI-RS resource REs are more than the real CSI-RS antenna ports.
  • the eNB can inform the UE the resources for CSI-RS in similar way to that in FIG. 6 .
  • the eNB can inform the UE which configuration resources of Config. 0, 2, 5 are to be muted by an RRC signal or alternatively, one of the configurations can be default to be mute in A2, e.g. Config.5 as illustrated in FIG. 7 , so no RRC signal is required anymore.
  • a still further CSI-RS port resource allocation scheme for 24 CSI-RS ports in accordance with embodiments of the present disclosure.
  • This one 4-port/or two 2-port CSI-RS resource can be configured by RRC signaling, or alternatively, the 4-port/or two 2-port CSI-RS resource can be default information between the eNB and the UE.
  • the unused 4-port/or two 2-port CSI-RS resources can be different in the two PRB pair transmission groups. In other words, two chose 12-port CSI-RS configuration resources in different PRB pair transmission groups can be different.
  • FIG. 8 illustrates another CSI-RS port resource allocation scheme for 28 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure.
  • the transmission resource groups are divided in a similar way, i.e., the first transmission resource group contains PRB #n and the second transmission resource group contains PRB# n+1.
  • PRB #n+1 a 12-port CSI-RS resource A2 is configured to UE, which is a sub set of A1.
  • the eNB may send an indication to indicate the allocated 16-port CSI-RS resource A1, and for the unused REs in A2, the eNB can send another indication to inform the UE which one of four groups is not chosen or three of four groups are chosen by RRC signal, e.g. 2 bits.
  • A2 can be a default subset of A1, which means no RRC signaling is required, e.g.
  • the 8-port CSI-RS Config.2 on right side in PRB #n+1 can be not chosen, as described in the FIG. 8 by a dashed line block. That is to say, the eNB can inform the UE the resources for CSI-RS in similar way to that in FIG. 6 but the unused REs are not muted ones but ones not chosen for the UE, i.e., those not allocated to the UE. Moreover, for REs not to be chosen, they can also be informed to the UE by an indication like an RRC signaling, or the REs not to be chosen can be default information between the eNB and UE and in such a case no RCC signaling is required.
  • the eNB can further send an indication for the second group of configuration resources N2 to the UE directly in step 504 .
  • resources not to be chosen can be determined based on the first group of configuration resources N1 and the second group of configuration resources N2, and thus no RRC signaling or default information are required.
  • a N1-port CSI-RS resource A1 is configured in the first PRB pair
  • two 8-port CSI-RS configurations are configured to UE.
  • two 8-port CSI-RS configurations are configured by RRC signals. Therefore, in each RB pair, a 16-port CSI-RS resource is configured.
  • eNB only need to configure one 16-port CSI-RS resource one time for every PRB pair by legacy configurations mechanism, i.e. two 8-port CSI-RS configurations.
  • legacy configurations mechanism i.e. two 8-port CSI-RS configurations.
  • 32 REs are allocated to the UE both for 28 CSI-RS ports and 32 CSI-RS ports.
  • 4 REs in one of PRB groups are muted or unused by default information or by RRC signaling.
  • three 4-port CSI-RS configurations are configured to UE.
  • three 4-port CSI-RS configurations are configured by RRC signals.
  • a 12-port CSI-RS resource is configured and 24 REs are allocated to the UE both for 20 CSI-RS ports and 24 CSI-RS ports by combining two adjacent RBs.
  • eNB only need to configure one 12-port CSI-RS resource one time for every PRB pair by legacy configurations mechanism, i.e. three 4-port CSI-RS configurations.
  • legacy configurations such as 8-port configurations, 4-port configurations or 2-port configurations
  • more ports can be supported CSI-RS resource.
  • 4 REs in one of PRB groups are muted or unused by default information or by RRC signaling.
  • FIG. 9 illustrates a further CSI-RS port resource allocation scheme for 28 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure.
  • the difference between the schemes as illustrated in FIG. 8 and FIG. 9 lies in that the REs not used in PRB#n+1 are not four adjacent REs but one of 4-port CSI-RS configurations.
  • the eNB can inform the UE which one of 4-port CSI-RS configurations is not chosen by RRC signaling, e.g. 2 bits.
  • Config.5 is not chosen as illustrated in dashed lines and therefore, and A2 only occupies 12-port CSI-RS resource.
  • a similar scheme can be adopted to that illustrated in FIG. 7 , but those unused REs are not muted but those not chosen to allocated to the UE.
  • FIG. 10 illustrates a still further CSI-RS port resource allocation scheme for 28 CSI-RS ports in accordance with embodiments of the present disclosure.
  • This one 2-port CSI-RS resource can be configured by RRC signaling, e.g. 3 bits or alternatively, the 2-port CSI-RS resource can be default information between the eNB and the UE.
  • the unused 2-port CSI-RS resources can be different in the two PRB pair transmission groups.
  • FIG. 11 illustrates another CSI-RS port resource allocation scheme for 20 CSI-RS ports in accordance with embodiments of the present disclosure.
  • This one 2-port CSI-RS resource can be configured by RRC signaling, or alternatively, the 2-port CSI-RS resource can be default information between the eNB and the UE.
  • the unused 2-port CSI-RS resources can be different in the two PRB pair transmission groups.
  • FIG. 12 illustrates an example transmission resource group division and CSI-RS port resource allocation schemes in TDM mode in accordance with embodiments of the present disclosure.
  • All port CSI-RS resource REs are allocated within two PRB groups (PRB #x) in different subframes (subframes n and m).
  • PRB #x PRB #x
  • a 16(N1)-port CSI-RS resource is configured the first group of subframes n
  • a 12(N2)-port CSI-RS resource is configured in the second group of subframes m, which is chosen from the 16(N1)-port CSI-RS resource with four REs or a port configuration muted or unallocated.
  • the difference between resource allocation schemes in TDM and FDM lies in the division of the transmission resource, and other specific resource allocations can reuse those in FDM.
  • same port resources can be configured for the first and second groups of subframes and those not to be used can be muted; or alternatively, those not to be used can are allocated to UE at all for data or other RS transmission.
  • information about the resource configurations can be sent to the UE by means of similar solution as described with reference to the FDM mode.
  • FIG. 13 illustrates a CSI-RS port resource allocation scheme for a 28-port CSI-RS configuration in FDM mode in accordance with embodiments of the present disclosure.
  • PRB #n ⁇ 1 and PRB n+1 are two closet transmission resources in which four REs are muted or unallocated.
  • the resources to be muted or allocated are not four adjacent REs but a 4-port resource configuration, like Config. 5.
  • the eNB can send an indication for Zero power (ZP) CSI-RS configuration to the UE to indicate resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • ZP CSI-RS can be configured for one single transmission resource group to, for example, avoid signal interference. That is to say, for different transmission resource groups, it is possible to configure different ZP CSI-RSs by means of ZP CSI-RS configurations. As illustrated in FIG. 14 , for 28 ports, for some UEs which need to be configured ZP CSI-RS in these REs, the eNB can configure different ZP CSI-RSs in different transmission groups.
  • the eNB can use the existing mechanism to configure ZP CSI-RS for every PRBs in one subframe, e.g. the eNB can use the existing bit map to configure ZP CSI-RS in 4-port CSI-RS configs. 0, 2, 5, 7. And then the eNB uses a new ZP CSI-RS configuration indication to configure ZP-CSI-RS so that Config. 5 is only for the PRB group which contains PRB #n and it is not used in the PRB group which contains PRB #n+1.
  • the new ZP CSI-RS can be used to configure a subset of a transmission resource group and thus different ZP CSI-RS are configured for PRB #n ⁇ 1 and PRB #n+1.
  • the PRB group contains PRB#n ⁇ 1 and #n+1 can be further divided to 2 sub-group, the ZP CSI-RS can be configured for the two sub-groups separately.
  • a further new ZP CSI-RS configuration can also be introduced.
  • one CDM-4 group in legacy 16-port CSI-RS can form one unit; in other word, each 8-port CSI-RS resource can be divided into 2 units.
  • all CSI-RS resources (five 8-port CSI-RS configurations for FDD) are divided to 10 units (unit 0 to 9) for normal subframes and normal CPs, and the eNB can use a RRC signal to configure some of units 0 to 9 are ZP CSI-RS. Therefore, in such a case, the ZP CSI-RS configuration is directed to one or more units instead of a specific CSI-RS configuration.
  • an antenna array for transmitting the reference signals can be divided to at least a first sub-array and a second sub-array so as to be mapped to the first transmission resource group and the second transmission resource group respectively.
  • FIGS. 16 to 38 to describe the division of the antenna array.
  • the antenna array is divided based on rows and/or columns of the antenna array.
  • the antenna array can be divided based on rows or columns. For example, two consecutive rows can form a sub-array as illustrated in FIG. 16 , or two consecutive columns can form a sub-array as illustrated in FIG. 17 .
  • the antenna array can be divided into sub-array 1 (a first sub-array) for PRB group 1 (a first transmission resource group) and a sub-array 2 (a second sub-array) for PRB group 2 (a second transmission resource group).
  • the sub-arrays can be mapped to two adjacent PRBs, i.e., PRB #n and PRB #n+1, those combined together to transmit CSI-RS as illustrated in FIG. 18 ; while in TDM, the sub-arrays can be mapped to two different subframes, i.e., subframe #n and subframe #m, as illustrated in FIG. 19 .
  • FIGS. 18 and 19 are illustrated with 32-port CSI-RS configuration as an example, and for other port configurations, it can use similar schemes.
  • FIGS. 20 to 21 illustrate other different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 4 ⁇ 4 ⁇ 2 antenna array is used.
  • two staggered rows form a sub-array and specifically, the first and third rows in the array form the sub-array 1 for the PRB group 1 while the second and fourth rows in the array form the sub-array 2 for the PRB group 2.
  • staggered two columns form a sub-array, and specifically, the first and third columns in the array form the sub-array 1 for the PRB group 1 while the second and fourth column s in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 22 to 23 illustrate further different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 8 ⁇ 2 antenna array or a 8 ⁇ 2 ⁇ 2 antenna array is used.
  • a 2 ⁇ 8 ⁇ 2 antenna array or a 8 ⁇ 2 ⁇ 2 antenna array is used.
  • four consecutive columns form a sub-array and specifically, the first to fourth columns in the antenna array form the sub-array 1 for the PRB group 1 while the fifth and eighth columns in the array form the sub-array 2 for the PRB group 2.
  • four consecutive rows form a sub-array and specifically, the first to fourth rows in the array form the sub-array 1 for the PRB group 1 while the fifth and eighth rows in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 24 to 25 illustrate still further different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 8 ⁇ 2 antenna array or a 8 ⁇ 2 ⁇ 2 antenna array is used.
  • a 2 ⁇ 8 ⁇ 2 antenna array or a 8 ⁇ 2 ⁇ 2 antenna array is used.
  • four staggered columns form a sub-array and specifically, the first, third, fifth and seventh columns in the array form the sub-array 1 for the PRB group 1 while the second, fourth, sixth and eighth columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 24 four staggered columns form a sub-array and specifically, the first, third, fifth and seventh columns in the array form the sub-array 1 for the PRB group 1 while the second, fourth, sixth and eighth columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 24 illustrate still further different sub-array divisions for 32 CSI-RS ports in accordance with embodiments of the present disclosure,
  • four staggered rows form a sub-array and specifically, the first, third, fifth and seventh rows in the array form the sub-array 1 for the PRB group 1 while the second, fourth, sixth and eighth rows in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 26 to 27 illustrate different sub-array divisions for 28 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 7 ⁇ 2 or 7 ⁇ 2 ⁇ 2 antenna array is used.
  • consecutive columns form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to fourth columns in the array form the sub-array 1 for the PRB group 1 while the fifth and seventh columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 26 consecutive columns form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to fourth columns in the array form the sub-array 1 for the PRB group 1 while the fifth and seventh columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 26 consecutive columns form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to fourth columns in the array form the sub
  • consecutive rows form a sub-array
  • the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to fourth rows in the array form the sub-array 1 for the PRB group 1 while the fifth and seventh rows in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 28 to 29 illustrate other different sub-array divisions for 28 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 7 ⁇ 2 or 7 ⁇ 2 ⁇ 2 antenna array is used.
  • the antenna array is divided into two overlapping groups wherein the overlapping part is illustrated by an area with dots, as illustrated in FIGS. 28 and 29 .
  • the sub-array 1 and sub-array 2 have the same number of ports since the overlapping part is used in both PRB groups.
  • FIGS. 30 to 31 illustrate different sub-array divisions for 24 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 3 ⁇ 4 ⁇ 2 antenna array is used.
  • one row in the antenna array forms a sub-array and two consecutive rows form another sub-array 2; specifically, the first column in the array forms the sub-array 1 for the PRB group 1 while the second and third columns in the array form the sub-array 2 for the PRB group 2.
  • consecutive columns form a sub-array; specifically, the first and second columns in the array form the sub-array 1 for the PRB group 1 while the third and fourth columns in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 32 to 33 illustrate other different sub-array divisions for 24 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 4 ⁇ 3 ⁇ 2 antenna array is used.
  • two consecutive rows form a sub-array; specifically, the first and second rows in the array form the sub-array 1 for the PRB group 1 while the third and fourth rows in the array form the sub-array 2 for the PRB group 2.
  • one column in the antenna array forms a sub-array and two consecutive columns form another sub-array; specifically, the first and second columns in the array form the sub-array 1 for the PRB group 1 while the third column in the array forms the sub-array 2 for the PRB group 2.
  • FIGS. 34 to 35 illustrate different sub-array divisions for 20 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 5 ⁇ 2 or 5 ⁇ 2 ⁇ 2 antenna array is used.
  • consecutive columns form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to third columns in the array form the sub-array 1 for the PRB group 1 while the fourth and fifth columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 34 consecutive columns form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to third columns in the array form the sub-array 1 for the PRB group 1 while the fourth and fifth columns in the array form the sub-array 2 for the PRB group 2.
  • FIG. 34 illustrate different sub-array divisions for 20 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 5 ⁇ 2 or 5 ⁇ 2 ⁇ 2 antenna
  • consecutive rows form a sub-array but the sub-array 1 and the sub-array 2 have different numbers of ports; specifically, the first to second rows in the array form the sub-array 1 for the PRB group 1 while the third and fifth rows in the array form the sub-array 2 for the PRB group 2.
  • FIGS. 36 to 37 illustrate other different sub-array divisions for 20 CSI-RS ports in accordance with embodiments of the present disclosure, wherein a 2 ⁇ 5 ⁇ 2 or 5 ⁇ 2 ⁇ 2 antenna array is used.
  • the antenna array is divided into two overlapping groups wherein the overlapping part is illustrated by an area with dots, as illustrated in FIGS. 36 and 37 .
  • the sub-array 1 and sub-array 2 have the same number of ports since the overlapping part is used in both PRB groups.
  • At least one of the first sub-array and the second sub-array can be further divided into a plurality of sub-array groups so as to be mapped to different configuration resources in respective one of the first group of configuration resources and the second group of configuration resources.
  • different sub-array groups can be mapped onto different CSI-RS configuration resource in each transmission resource group.
  • the sub-array can be divided based on based on rows and/or columns of the antenna array or polarization directions of antennae in the antenna array. For example, the mechanism for dividing the sub-array can be different for CDM-2 and CDM-4.
  • a sub-array can be divided based on rows and/or columns of the antenna array since it is allowed to comprise different polarizations in a single transmission resource group. While for CDM-4, a sub-array can be divided based on polarization directions of the antenna array since a single transmission resource group shall use antennae with same polarizations.
  • FIG. 38 illustrates an example sub-array group division for 32 CSI-RS ports with CDM-2 in accordance with embodiments of the present disclosure.
  • two 8-port CSI-RS configurations are allocated in each PRB and each of the sub-arrays 1 and 2 is further divided into two sub-array group 1 and 2 based on rows, and each of sub-array groups 1 and 2 is mapped to one 8-port CSI-RS configuration within PRB #n or PRB #n+1.
  • the sub-array group 1 within the sub-array 1 is mapped to Conf. 0 in PRB #n
  • the sub-array group 2 within the sub-array 1 is mapped to Conf.
  • the sub-arrays 1 and 2 can also be divided into two sub-array group 1 and 2 based on other rules, like column, or both rows and column.
  • FIG. 39 illustrates an example sub-array group division for 28 CSI-RS ports with CDM-2 in accordance with embodiments of the present disclosure.
  • the antenna array is divided into two sub arrays 1, 2 based on rows with the scheme as illustrated in FIG. 28 and each of the sub-arrays 1 and 2 is further divided into two sub-array group 1 and 2 based on rows, as illustrated in FIG. 39 .
  • each of sub-array groups 1 and 2 is mapped to one 8-port CSI-RS configuration within PRB #n or PRB #n+1.
  • FIG. 40 illustrates an example sub-array group division for 32 CSI-RS ports with CDM-4 in accordance with embodiments of the present disclosure.
  • two 8-port CSI-RS configurations are allocated in each PRB and each of the sub-arrays 1 and 2 is further divided into two sub-array group 1 and 2 based on their polarizations, and each of sub-array group 1 and 2 is mapped to one 8-port CSI-RS configuration.
  • the sub-array group 1 comprises antennae with a first polarization (indicated by solid lines) and the sub-array group 2 comprises antennae with a different second polarization (indicated by dashed lines).
  • Sub-array group 1 and 2 in sub-array 1 maps on Config. 0 and Config. 2 within PRB #n respectively.
  • Sub-array group 1 and 2 in sub-array 2 maps on Config. 0 and Config. 2 within PRB #n+1 respectively.
  • the eNB can configure Rel-13 UE to 16 CSI-RS ports. Therefore, the Rel-13 UE and new UE share the same CSI-RS resource.
  • the 16-port CSI-RS in PRB #n and PRB #n+1 measured by Rel-13 UEs are from different antenna ports, but it is transparent for Rel-13 UEs. In this sense, it may impact channel estimation to legacy UE.
  • the solution as described herein can reduce CSI-RS overhead significantly since the new UE and the legacy UE can use the CDM in the same way and the legacy UE needs no additional CSI-RS resources.
  • all solutions described herein can also be used in the Downlink Pilot Time Slot (DwPTs).
  • DwPTs Downlink Pilot Time Slot
  • FIG. 41 illustrates an example sub-array group division for 24 CSI-RS ports in TDM mode in accordance with embodiments of the present disclosure.
  • sub-array 1 contains two 8-port CSI-RS configurations and sub-array 2 contains one 8-port CSI-RS configuration.
  • Sub-array 2 is further divided into two sub-array group 1 and 2 based on their polarizations, and each of sub-array group 1 and 2 is mapped to one 8-port CSI-RS configuration within the sub-array 2.
  • the sub-array group 1 comprises antennae with a first polarization (indicated by solid lines) and the sub-array group 2 comprises antennae with a different second polarization (indicated by dashed lines).
  • Sub-array group 1 and 2 in sub-array 1 are mapped on Config. 0 and Config. 2 respectively within subframe #n and the sub-array 2 maps on the 8-port CSI-RS configuration (Config. 1) within subframe #m, as illustrated in FIG. 42 .
  • the two subframes #m and #n are better to be two consecutive or close subframes for better channel estimation.
  • the eNB can configure 16 CSI-RS ports to legacy Rel-13 UEs with CDM-4 in subframe #n.
  • the eNB can also configure legacy UE 8 ports with CDM-2.
  • the antenna array division scheme is not limited to the CSI-RS port extension solution as described hereinabove and it can also be applied to any solution wherein different transmission resource groups are used.
  • FIGS. 38 to 42 are only some examples of sub-array group division and the present disclosure is not limited thereto. In addition, these embodiments do not show all possibilities of sub-array group division for all possible ports; however the skilled in the art can implement the division based on the ideas and principles as described herein.
  • FIG. 43 illustrates an example of Orthogonal Variable Spreading Factor (OVSF) for OCC in accordance with embodiments of the present disclosure. From FIG. 43 , it is clear that the OVSF is a 8 ⁇ 8 matrix.
  • OVSF Orthogonal Variable Spreading Factor
  • the CDM-8 can be supported, which can achieve better channel estimation and at the same ensure the power boosting not exceeding the threshold 6 dB.
  • there is a threshold 6 dB for power boosting and if the solution recited in the present disclosure is used, there is a risk that the power boosting exceeds the threshold 6 dB since transmission resource groups are used and more REs are used.
  • 8-port CSI-RS can be mapped onto one legacy 8-port CSI-RS resource, i.e. one legacy 8-port CSI-RS resource is a CDM-8 group.
  • same resource configurations are multiplexed by using the high order OCC sequence and/or wherein different resource configurations are multiplexed by using the high order OCC sequence.
  • CSR-RSs are mapped onto 8-port CSI-RS configuration 2, 3 in PRB #n and PRB #n+1 by CDM 8 and thus all CSI-RS ports are mapped within two PRBs.
  • CDM 8 In a case of 32 ports within a single PRB, it is also possible to use CDM 8. As illustrated in FIG. 45 , CSR-RSs are mapped onto 8-port CSI-RS configuration 0, 1, 2, 3 in PRB #n by CDM 8 and thus all CSI-RS ports are mapped within one PRB.
  • FIG. 46 illustrates another scheme for CDM 8 for 32 CSI-RS ports in FDM mode in accordance with embodiments of the present disclosure.
  • a 8-port CSI-RS can map on REs which are combined from a part of first 8-port CSI-RS configuration and a part of the second 8-port CSI-RS configuration. That is to say, resource group 0 and 2 are combined together by CDM 8.
  • FIG. 47 illustrates further scheme for CDM 8 for 32 CSI-RS ports in TDM mode in accordance with embodiments of the present disclosure.
  • 8 ports CSI-RS within one CDM8 group can map on REs which are combined from the part of first 8-port CSI-RS resource within subframe #n and the part of the second 8-port CSI-RS resource within subframe #m.
  • the first part and the second part come from different subframes, as indicated by bold line blocks, dashed line blocks, heavy dashed line blocks and light dashed line blocks in FIG. 47 .
  • the OCC sequence can be configured to comply with the legacy UE.
  • the OCC sequence can include two parts, a first sequence part and a second sequence part as illustrated in FIG. 48 , wherein the first sequence part contains legacy OCC sequences and the second sequence part contains extended OCC sequences.
  • the first sequence part is [1, 1,1, 1] which is an OCC sequence defined for CDM-4 in 36.211 d00 of Rel. 13 Agreements in RAN1 #84 and the second sequence part is a new one [ ⁇ 1 ⁇ 1 ⁇ 1 ⁇ 1 ].
  • the first sequence part can be mapped on the first subframe #n, and the second sequence part can be mapped on the second subframe #m as illustrated in FIG. 49 .
  • the legacy UE and the new UE may share same CSI-RS resource in the first subframe. That is to say, configuration resources which can be used by legacy users are multiplexed using the first sequence part.
  • the antenna port measured by legacy UE is virtualized by two new ports.
  • each port is mapped onto 8 REs and corresponds to one 8-length OCC sequence.
  • port a corresponds to the OCC sequence [1 1 1 1 1 1 1]
  • port b corresponds to the OCC sequence [1 1 1 1 ⁇ 1 ⁇ 1 ⁇ 1 ⁇ 1] and it is clear that the two OCC sequence share the same first sequence part.
  • the OCC sequence for some antenna ports may be set to multiply e j ⁇ instead of the binary value, as illustrated in FIG. 51 .
  • the ⁇ can be set with best downtilt when deployment.
  • CDM 8 scheme can also be applied a solution wherein all ports are located within a single PRB and is not limited the solution with two different transmission resource groups. In fact, it is possible to apply the CDM-8 scheme to any solution wherein four RE can be combined together.
  • it may support more ports for reference signals such as CSI-RS, and the legacy CSI-RS resource configuration mechanism can be reused and at the same time the RRC signal overhead, standard complexity and impact on the legacy UE can be reduce substantially.
  • reference signals such as CSI-RS
  • FIG. 52 further illustrates a flow chart of a method of receiving reference signals in accordance with the present disclosure.
  • the method 5200 can be performed at the terminal device like UE.
  • reference signals are received in a first group of configuration resources within a first transmission resource group and in step 5202 , reference signals are received in a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • the transmission resources can be divided into at least two transmission resource groups, and reference signals are transmitted by combining transmission resources from both the transmission resource groups; in other words, at least two PRBs or at least two subframes are used jointed to transmit reference signals like CSI-RS to support more CSI-RS ports to improve channel estimation values.
  • the first group of configuration resources and the second group of configuration resources can be determined as described hereinabove and thus, legacy CSI-RS resource configuration mechanism may be reused. That is to say, the allocated resource configurations comprise a combination of legacy resource configurations for reference signal.
  • the legacy resource configurations may comprise 2-port configuration, 4-port configuration and 8-port configuration.
  • Resources in the allocated resource configurations unused by the first group of configuration resources and/or the second group of configuration resources can be notified to the UE by RRC signals to mute them or cancel their configuration.
  • RRC signal overhead, standard complexity and impact on legacy UE can be reduced.
  • two 8-port CSI-RS configurations can be configured to UE by RRC signals and thus in each RB, 16-port CSI-RS resource is configured.
  • 16-port CSI-RS resource is configured.
  • By combing two adjacent RB totally 32 RE are allocated to the UE for both 28 CSI-RS ports and 32 CSI-RS port.
  • For 28 CSI-RS four REs or one 4-port configuration are unused.
  • the unused resources can be muted; or alternatively, an RRC signal can be used to cancel the allocation of the unused resources.
  • three 4-port CSI-RS configurations can be configured to UE by RRC signals and thus in each RB, 12-port CSI-RS resource is configured.
  • one of the first transmission resource group and the second transmission resource group can contain odd-numbered physical resource blocks while the other of them contains even-numbered physical resource blocks.
  • one of the first transmission resource group and the second transmission resource group contains physical resource blocks in a first group of subframes and the other of them contains physical resource blocks in a different second group of subframes.
  • the resource configurations can be allocated based on predetermined rules which are known for both the eNB and UR and thus, and thus notification of detailed information on the resource configurations can be omitted.
  • the information about the resource configurations can also be indicated by one or more indication.
  • the UE may receive an indication for the allocated resource configurations at step 5203 .
  • the first group of configuration resources can be determined based on the allocated resource configurations and the second group of configuration resource can be determined based on the first group of configuration resources.
  • the UE may receive an indication for the first group of configuration resource and determines the second group of configuration resource based on the first group of configuration resources.
  • the UE may also receive an indication for the second group of configuration resource in step 5204 .
  • the UE may receive an indication for resource configurations and receive an indication for resources in the resource configurations not to be allocated to the first group of configuration resources and/or the second group of configuration resources. Thus, no superfluous resources are allocated to the UE.
  • the resources in the allocated resource configurations to be muted may contain predetermined resource elements or a predetermined port configuration. Or alternatively, the UE may receive an indication for resource elements or a port configuration to be muted in step 5205 .
  • an indication for zero power configuration may further be used.
  • the UE may further receive, in step 5206 , an indication for zero power configuration which indicates resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • the reference signals for different layers can be obtained from same configuration resources with a high order orthogonal cover code (OCC) sequence, for example those with a length of 8 as illustrated in FIG. 43 .
  • OCC orthogonal cover code
  • CDM8 can be used, and it is possible multiplex same resource configurations by using the high order OCC sequence and it is possible to multiplex different resource configurations using the high order OCC sequence.
  • the high order OCC sequence can include a first sequence part containing legacy OCC sequence and a second sequence part containing extended OCC sequence.
  • the method 5200 is described in brief with reference to FIG. 52 . It is noted that steps and features in the methods 5200 have a corresponding functionalities to those as described with reference to FIGS. 5 to 51 . Therefore, for details about the operations and functionalities, one may refer to those descriptions made with respect to the respective steps of the methods with reference to FIGS. 5 to 51 .
  • FIG. 53 schematically illustrates an apparatus for transmitting reference signals according to an embodiment of the present disclosure.
  • the apparatus 5300 can be comprised at a serving node, for example a BS, like a node B (NodeB or NB).
  • a serving node for example a BS, like a node B (NodeB or NB).
  • NodeB or NB node B
  • the apparatus 5300 comprises a first reference signal transmission unit 5301 and a second reference signal transmission unit 5302 .
  • the first reference signal transmission unit 5301 is configured to transmit the reference signals using a first group of configuration resources within a first transmission resource group
  • the second reference signal transmission unit 5302 is configured to transmit the reference signals using a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • the first group of configuration resources can be a part of the allocated resource configurations, or some resources in the allocated resource configurations.
  • resources in the allocated resource configurations unused by the first group of configuration resources and/or the second group of configuration resources can be muted.
  • the allocated resource configurations can comprise a combination of legacy resource configurations for reference signal.
  • the second group of configuration resources contain different configuration resources for two closet transmission resources in the second transmission resource group.
  • the apparatus 5300 may further comprise: an allocated resource indication transmission unit 5303 , which is configured to transmit an indication for the allocated resource configurations.
  • the apparatus may further comprise a first group resource indication transmission unit 5303 ′, which is configured to transmit an indication for the first group of configuration resources.
  • the apparatus 5300 further comprises a second group resource indication transmission unit 5304 , configured to transmit an indication for the second group of configuration resource.
  • the allocated resource indication transmission unit 5303 may further be configured to transmit an indication for resource configurations; and transmit an indication for resources in the resource configurations not to be allocated to the first group of configuration resources and/or the second group of configuration resources.
  • the apparatus 5300 may further comprise a resource muting indication transmission unit 5305 which is configured to transmit an indication for resource elements or a port configuration to be muted to indicate the unused resources in the allocated resource configurations.
  • the apparatus may further comprise: a zero power configuration indication transmission unit 5306 , configured to transmit an indication for zero power configuration to indicate resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • a zero power configuration indication transmission unit 5306 configured to transmit an indication for zero power configuration to indicate resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • an antenna array for transmitting the reference signals is divided to at least a first sub-array and a second sub-array, and wherein one of the first sub-array and the second sub-array is mapped to the first transmission resource group and the other of them is mapped to the second transmission resource group.
  • the antenna array can be divided based on rows and/or columns of antennae in the antenna array.
  • the first sub-array and the second sub-array can be partially overlapped with each other for some reference signal ports.
  • At least one of the first sub-array and the second sub-array can be further divided into a plurality of sub-array groups; and wherein the plurality of sub-array groups are mapped to different configuration resources in respective one of the first group of configuration resources and the second group of configuration resources.
  • the sub-array can be divided based on rows and/or columns of antennae in the antenna array or based on polarization directions of the antennae.
  • the reference signals can be transmitted with a high order orthogonal cover code (OCC) sequence.
  • the high order OCC sequence can include a first sequence part containing legacy OCC sequences and a second sequence part containing extended OCC sequences, wherein configuration resources which can be used by legacy users are multiplexed by using the first sequence part.
  • FIG. 54 further schematically illustrates an apparatus 5400 for receiving reference signals in accordance with the present disclosure.
  • the apparatus 5400 can be comprised at the terminal device like UE.
  • the apparatus 5400 comprises a first reference signal receiving unit 5401 and a second reference signal receiving unit 5402 .
  • the first reference signal receiving unit 5401 is configured to receive the reference signals in a first group of configuration resources within a first transmission resource group.
  • the second reference signal receiving unit 5402 is configured to receive the reference signals in a second group of configuration resources within a second transmission resource group.
  • the first group of configuration resources are determined based on allocated resource configurations for the reference signals and the second group of configuration resources are a subset of the first group of configuration resources.
  • the first group of configuration resources can be a part of the allocated resource configurations, and resources in the allocated resource configurations unused by the first group of configuration resources and/or the second group of configuration resources are muted.
  • the allocated resource configurations may comprise a combination of legacy resource configurations for reference signals.
  • the second group of configuration resources may contain different configuration resources for two closet transmission resources in the second transmission resource group.
  • the apparatus 5400 may further comprise an allocated resource indication receiving unit 5403 , configured to receive an indication for the allocated resource configurations, and wherein the first group of configuration resources are determined based on the allocated resource configurations.
  • the apparatus 5400 may further comprise a first group resource indication receiving unit 5403 ′, configured to receive an indication for the first group of configuration resources.
  • the apparatus 5400 may further comprise a second group resource indication receiving unit 5404 , configured to receive an indication for the second group of configuration resource.
  • the allocated resource indication receiving unit 5403 may be further configured to receive an indication for resource configurations; and receive an indication for resources in the resource configurations not to be allocated to the first group of configuration resources and/or the second group of configuration resources.
  • the resources in the allocated resource configurations to be muted contain predetermined resource elements or a predetermined port configuration.
  • the apparatus may further comprise: a resource muting indication receiving unit 5405 , configured to receive an indication for resource elements or a port configuration to be muted.
  • the apparatus 5400 may further comprise: a zero power configuration indication receive unit 5406 , configured to receive an indication for zero power configuration which indicates resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • a zero power configuration indication receive unit 5406 configured to receive an indication for zero power configuration which indicates resource elements or a port configuration to be muted in the first group of configuration resources or the second group of configuration resources.
  • the reference signals for different layers can be obtained from same configuration resources with a high order orthogonal cover code (OCC) sequence.
  • OCC orthogonal cover code
  • the high order OCC sequence may include a first sequence part containing legacy OCC sequences and a second sequence part containing extended OCC sequence and wherein the reference signals for different layers on configuration resources which can be used by legacy users are obtained by using the first sequence part.
  • the apparatuses 5300 and 5400 are described in brief with reference to FIGS. 53 to 54 . It is noted that the apparatuses 5300 and 5400 may be configured to implement functionalities as described with reference to FIGS. 5 to 52 . Therefore, for details about the operations of modules in these apparatuses, one may refer to those descriptions made with respect to the respective steps of the methods with reference to FIGS. 5 to 52 .
  • the components of the apparatuses 5300 and 5400 may be embodied in hardware, software, firmware, and/or any combination thereof.
  • the components of apparatuses 5300 and 5400 may be respectively implemented by a circuit, a processor or any other appropriate selection device.
  • those skilled in the art will appreciate that the aforesaid examples are only for illustration not for limitation and the present disclosure is not limited thereto; one can readily conceive many variations, additions, deletions and modifications from the teaching provided herein and all these variations, additions, deletions and modifications fall the protection scope of the present disclosure.
  • apparatuses 5300 and 5400 may each comprise at least one processor.
  • the at least one processor suitable for use with embodiments of the present disclosure may include, by way of example, both general and special purpose processors already known or developed in the future.
  • Apparatuses 5300 and 5400 may each further comprise at least one memory.
  • the at least one memory may include, for example, semiconductor memory devices, e.g., RAM, ROM, EPROM, EEPROM, and flash memory devices.
  • the at least one memory may be used to store program of computer executable instructions.
  • the program can be written in any high-level and/or low-level compliable or interpretable programming languages.
  • the computer executable instructions may be configured, with the at least one processor, to cause apparatuses 5300 and 5400 to at least perform operations according to the method as discussed with reference to FIGS. 5 to 52 respectively.
  • FIG. 55 further illustrates a simplified block diagram of an apparatus 5510 that may be embodied as or comprised in a terminal device such as UE for a wireless network in a wireless network and an apparatus 5520 that may be embodied as or comprised in a base station such as NB or eNB as described herein.
  • a terminal device such as UE for a wireless network in a wireless network
  • an apparatus 5520 that may be embodied as or comprised in a base station such as NB or eNB as described herein.
  • the apparatus 5510 comprises at least one processor 5511 , such as a data processor (DP) and at least one memory (MEM) 5512 coupled to the processor 5511 .
  • the apparatus 5510 may further comprise a transmitter TX and receiver RX 5513 coupled to the processor 5511 , which may be operable to communicatively connect to the apparatus 5520 .
  • the MEM 5512 stores a program (PROG) 5514 .
  • the PROG 5514 may include instructions that, when executed on the associated processor 5511 , enable the apparatus 5510 to operate in accordance with embodiments of the present disclosure, for example to perform the method 5200 .
  • a combination of the at least one processor 5511 and the at least one MEM 5512 may form processing means 5515 adapted to implement various embodiments of the present disclosure.
  • the apparatus 5520 comprises at least one processor 5521 , such as a DP, and at least one MEM 5522 coupled to the processor 5521 .
  • the apparatus 5520 may further comprise a suitable TX/RX 5523 coupled to the processor 5521 , which may be operable for wireless communication with the apparatus 5510 .
  • the MEM 5522 stores a PROG 5524 .
  • the PROG 5524 may include instructions that, when executed on the associated processor 5521 , enable the apparatus 5520 to operate in accordance with the embodiments of the present disclosure, for example to perform the method 500 .
  • a combination of the at least one processor 5521 and the at least one MEM 5522 may form processing means 5525 adapted to implement various embodiments of the present disclosure.
  • Various embodiments of the present disclosure may be implemented by computer program executable by one or more of the processors 5511 , 5521 , software, firmware, hardware or in a combination thereof.
  • the MEMs 5512 and 5522 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples.
  • the processors 5511 and 5521 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors DSPs and processors based on multicore processor architecture, as non-limiting examples.
  • the present disclosure may also provide a carrier containing the computer program as mentioned above, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • the computer readable storage medium can be, for example, an optical compact disk or an electronic memory device like a RAM (random access memory), a ROM (read only memory), Flash memory, magnetic tape, CD-ROM, DVD, Blue-ray disc and the like.
  • an apparatus implementing one or more functions of a corresponding apparatus described with one embodiment comprises not only prior art means, but also means for implementing the one or more functions of the corresponding apparatus described with the embodiment and it may comprise separate means for each separate function, or means that may be configured to perform two or more functions.
  • these techniques may be implemented in hardware (one or more apparatuses), firmware (one or more apparatuses), software (one or more modules), or combinations thereof.
  • firmware or software implementation may be made through modules (e.g., procedures, functions, and so on) that perform the functions described herein.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11949607B2 (en) * 2016-04-01 2024-04-02 Samsung Electronics Co., Ltd. Method and apparatus for coexistance of device-to-device communications and cellular communications in mobile communications system

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102458074B1 (ko) * 2016-03-31 2022-10-24 삼성전자 주식회사 이동 통신 시스템에서 이종 서비스 제공 방법 및 장치
WO2017171617A1 (en) 2016-04-01 2017-10-05 Telefonaktiebolaget Lm Ericsson (Publ) Reduced density channel state information reference signal
US10680855B2 (en) * 2016-05-13 2020-06-09 Huawei Technologies Co., Ltd. Measurement in non-cellular wireless networks
US10931418B2 (en) * 2016-09-30 2021-02-23 Telefonaktiebolaget Lm Ericsson (Publ) CDM8 based CSI-RS designs for MIMO
CN107888364B (zh) 2016-09-30 2020-07-21 电信科学技术研究院 一种参考信号映射方法及装置
CN108076520B (zh) * 2016-11-16 2020-02-14 上海朗帛通信技术有限公司 一种被用于ue和基站中的方法和设备
WO2018098802A1 (en) * 2016-12-02 2018-06-07 Qualcomm Incorporated Transmitting channel state information reference signals in new radio
CN110169002B (zh) * 2017-01-09 2021-11-30 Lg 电子株式会社 无线通信系统中发送参考信号的方法及其装置
CN108366377A (zh) * 2017-01-26 2018-08-03 索尼公司 电子设备、通信方法以及介质
CN108632008B (zh) * 2017-03-24 2023-06-02 华为技术有限公司 一种参考信号发送方法及装置
CN111436140B (zh) * 2019-03-25 2023-06-30 维沃移动通信有限公司 资源分配方法、释放方法、终端及网络设备
US20220183061A1 (en) * 2019-04-30 2022-06-09 Telefonaktiebolaget Lm Ericsson (Publ) Transmitting and receiving an indication
WO2021024326A1 (ja) * 2019-08-02 2021-02-11 株式会社Ｎｔｔドコモ 端末及び無線通信方法
EP4009722A4 (de) * 2019-08-02 2023-05-03 Ntt Docomo, Inc. Endgerät und drahtloskommunikationsverfahren
US11088745B2 (en) * 2019-08-16 2021-08-10 At&T Intellectual Property I, L.P. Determining channel state information in 5G or other next generation wireless communication systems with multiple transmission points
CN115834011B (zh) * 2019-11-06 2025-10-31 邦克山科技有限责任公司 一种被用于无线通信的节点中的方法和装置
US12048056B2 (en) * 2020-03-19 2024-07-23 Qualcomm Incorporated Cancellation indicator with configurable cancelled direction
WO2022205022A1 (zh) * 2021-03-30 2022-10-06 华为技术有限公司 用于传输参考信号的方法和装置
CN115606295A (zh) * 2021-03-31 2023-01-13 苹果公司（Us） 对参考信号的资源计数
US12542635B2 (en) * 2022-06-17 2026-02-03 Qualcomm Incorporated CSI-RS resource multiplexing
WO2025123363A1 (zh) * 2023-12-15 2025-06-19 Oppo广东移动通信有限公司 无线通信方法及设备

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100120442A1 (en) * 2008-11-12 2010-05-13 Motorola, Inc. Resource sharing in relay operations within wireless communication systems
US20100284351A1 (en) * 2007-09-12 2010-11-11 Sharp Kabushiki Kaisha Space-time-frequency domain based information feedback method, user equipment and base station thereof
EP2378703A1 (de) 2010-04-13 2011-10-19 Panasonic Corporation Umsetzung von Steuerinformationen zur Steuerung von Kanalelementen
US20110292847A1 (en) 2010-06-01 2011-12-01 Pantech Co., Ltd. Apparatus and method for allocating channel state information-reference signal in wireless communication system
US20120208547A1 (en) 2011-02-11 2012-08-16 Qualcomm Incorporated Method and apparatus for enabling channel and interference estimations in macro/rrh system
US20130208645A1 (en) * 2010-06-21 2013-08-15 Panasonic Corporation Configuration of uplink and downlink grant search spaces in an ofdm-based mobile communication system
US20130242904A1 (en) * 2012-03-15 2013-09-19 Futurewei Technologies, Inc. Systems and Methods for UE-Specific Search Space and ePDCCH Scrambling
WO2014166052A1 (en) 2013-04-09 2014-10-16 Panasonic Intellectual Property Corporation Of America Method of mapping csi-rs ports to resource blocks, base station and user equipment
EP2849481A1 (de) 2012-05-11 2015-03-18 Huawei Technologies Co., Ltd. Verfahren und vorrichtung zur meldung einer referenzsignalempfangsleistung
US20150264718A1 (en) * 2012-10-29 2015-09-17 Huawei Technologies Co., Ltd. Resource determining method, base station, and user equipment
EP2947935A1 (de) 2013-01-21 2015-11-25 Fujitsu Limited Verfahren zur übertragung eines kanalstatusinformationsreferenzsignals, basisstation, endgerät, system, maschinenlesbares programm und speichermedium zur speicherung des maschinenlesbaren programms
JP2015536099A (ja) 2012-09-28 2015-12-17 インターデイジタル パテント ホールディングス インコーポレイテッド 多次元アンテナ構成を使用する無線通信
WO2016013882A1 (ko) 2014-07-23 2016-01-28 엘지전자 주식회사 무선 접속 시스템에서 채널상태정보를 전송하는 방법 및 장치
US20160359660A1 (en) * 2015-01-30 2016-12-08 Telefonaktiebolaget Lm Ericsson (Publ) Wireless Communication System With Single-Subband User Equipment
US20170251466A1 (en) * 2015-03-09 2017-08-31 Telefonaktiebolaget Lm Ericsson (Publ) Defining sub-subchannels for data communication using separately provided frequency and time resources and related wireless terminals and network nodes
US20180013529A1 (en) * 2015-01-06 2018-01-11 Lg Electronics Inc. Downlink signal reception method and user equipment, and downlink signal transmission method and base station
US20180206073A1 (en) * 2015-07-16 2018-07-19 Huawei Technologies Co., Ltd. Transmission resource determining method and related device

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9083482B2 (en) * 2009-09-27 2015-07-14 Lg Electronics Inc. Method and apparatus for transmitting reference signal in wireless communication system
US8995465B2 (en) * 2010-05-04 2015-03-31 Qualcomm Incorporated Reference signal patterns
MX2012014098A (es) * 2010-06-01 2013-08-27 Zte Corp Metodos y sistemas para asignacion de recursos de csi-rs en un sistema de lte avanzada.
CN102347817B (zh) * 2010-08-02 2014-01-08 华为技术有限公司 通知参考信号配置信息的方法及设备
AU2015234324B2 (en) * 2011-01-07 2017-06-29 Interdigital Patent Holdings, Inc. Communicating channel state information (CSI) of multiple transmission points
US9119209B2 (en) * 2012-03-30 2015-08-25 Samsung Electronics Co., Ltd. Apparatus and method for channel-state-information pilot design for an advanced wireless network
EP2896240B1 (de) * 2012-09-11 2017-12-27 LG Electronics Inc. Verfahren und vorrichtung zur sendung von kanalstatusinformations-referenzsignalen in einem drahtlosen kommunikationssystem
EP2897308B1 (de) * 2012-09-16 2019-08-28 LG Electronics Inc. Verfahren und vorrichtung zum empfangen von daten in einem drahtlosen kommunikationssystem zur unterstützung einer kooperativen übertragung
WO2014046516A1 (en) * 2012-09-24 2014-03-27 Lg Electronics Inc. Method and apparatus for transmitting or receiving reference signal in wireless communication system
US20160006553A1 (en) * 2013-02-24 2016-01-07 Lg Electronics Inc. Method and apparatus for reporting downlink channel state
US10103797B2 (en) * 2013-03-01 2018-10-16 Intel IP Corporation Quasi co-location and PDSCH resource element mapping signaling for network assisted interference mitigation
WO2014205699A1 (zh) * 2013-06-26 2014-12-31 华为技术有限公司 参考信号的传输方法及装置
JP6114153B2 (ja) * 2013-09-26 2017-04-12 株式会社Ｎｔｔドコモ 基地局、移動局、参照信号送信方法及びチャネル品質測定方法
CN110545133B (zh) * 2013-12-20 2022-12-06 北京三星通信技术研究有限公司 信道状态信息汇报的方法及装置
US10225054B2 (en) * 2014-11-07 2019-03-05 Electronics And Telecommunications Research Institute Method and apparatus for transmitting reference signal, method and apparatus for measuring and reporting channel state information, and method for configuring the same
US9900198B2 (en) * 2015-02-20 2018-02-20 Samsung Electronics Co., Ltd. Channel-state-information reference signals for advanced wireless systems

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100284351A1 (en) * 2007-09-12 2010-11-11 Sharp Kabushiki Kaisha Space-time-frequency domain based information feedback method, user equipment and base station thereof
US20100120442A1 (en) * 2008-11-12 2010-05-13 Motorola, Inc. Resource sharing in relay operations within wireless communication systems
EP2378703A1 (de) 2010-04-13 2011-10-19 Panasonic Corporation Umsetzung von Steuerinformationen zur Steuerung von Kanalelementen
US20110292847A1 (en) 2010-06-01 2011-12-01 Pantech Co., Ltd. Apparatus and method for allocating channel state information-reference signal in wireless communication system
US20130208645A1 (en) * 2010-06-21 2013-08-15 Panasonic Corporation Configuration of uplink and downlink grant search spaces in an ofdm-based mobile communication system
US20120208547A1 (en) 2011-02-11 2012-08-16 Qualcomm Incorporated Method and apparatus for enabling channel and interference estimations in macro/rrh system
US20130242904A1 (en) * 2012-03-15 2013-09-19 Futurewei Technologies, Inc. Systems and Methods for UE-Specific Search Space and ePDCCH Scrambling
EP2849481A1 (de) 2012-05-11 2015-03-18 Huawei Technologies Co., Ltd. Verfahren und vorrichtung zur meldung einer referenzsignalempfangsleistung
JP2015536099A (ja) 2012-09-28 2015-12-17 インターデイジタル パテント ホールディングス インコーポレイテッド 多次元アンテナ構成を使用する無線通信
US20150264718A1 (en) * 2012-10-29 2015-09-17 Huawei Technologies Co., Ltd. Resource determining method, base station, and user equipment
EP2947935A1 (de) 2013-01-21 2015-11-25 Fujitsu Limited Verfahren zur übertragung eines kanalstatusinformationsreferenzsignals, basisstation, endgerät, system, maschinenlesbares programm und speichermedium zur speicherung des maschinenlesbaren programms
WO2014166052A1 (en) 2013-04-09 2014-10-16 Panasonic Intellectual Property Corporation Of America Method of mapping csi-rs ports to resource blocks, base station and user equipment
US20160050153A1 (en) 2013-04-09 2016-02-18 Panasonic Intellectual Property Corporation Of America Method of mapping csi-rs ports to resource blocks, base station and user equipment
WO2016013882A1 (ko) 2014-07-23 2016-01-28 엘지전자 주식회사 무선 접속 시스템에서 채널상태정보를 전송하는 방법 및 장치
US20180013529A1 (en) * 2015-01-06 2018-01-11 Lg Electronics Inc. Downlink signal reception method and user equipment, and downlink signal transmission method and base station
US20160359660A1 (en) * 2015-01-30 2016-12-08 Telefonaktiebolaget Lm Ericsson (Publ) Wireless Communication System With Single-Subband User Equipment
US20170251466A1 (en) * 2015-03-09 2017-08-31 Telefonaktiebolaget Lm Ericsson (Publ) Defining sub-subchannels for data communication using separately provided frequency and time resources and related wireless terminals and network nodes
US20180206073A1 (en) * 2015-07-16 2018-07-19 Huawei Technologies Co., Ltd. Transmission resource determining method and related device

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Communication dated Mar. 17, 2020, from the Japanese Patent Office in Application No. 2018-568472.
Extended European Search Report dated Sep. 24, 2019 issued by the European Patent Office in counterpart application No. 16895889.0.
International Search Report of PCT/CN2016/077831 filed Mar. 30, 2016.
Notification of Reasons for Refusal dated Sep. 3, 2019 issued by the Japanese Patent Office in counterpart application No. 2018-568472.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11949607B2 (en) * 2016-04-01 2024-04-02 Samsung Electronics Co., Ltd. Method and apparatus for coexistance of device-to-device communications and cellular communications in mobile communications system

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